Solution to a Common V-Star Problem? - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 04-01-2014, 10:19 PM Thread Starter
Junior Member
 
Join Date: Apr 2014
Posts: 7
Solution to a Common V-Star Problem?

Maybe someone can chime in and explain what happened better than I can, but here's a solution to what's been called, on the internet, a common problem with the V-Star 650. This is also a problem that doesn't seem to ever get a straight answer given as to how to fix it, hence why I wanted to post here.

Background: I bought a 2001 V-Star 650 with 7400 miles on it for $420. The guy said he hadn't rode it in about 3 years, the plates expired 5 years ago.

I bought the bike, and got my brother to rebuild the carbs. It started on full choke, but died on closed choke. I recleaned the carbs a couple more times, and it started idling well with the choke closed.

When I twisted the throttle, the bike would rev up until about 1/2 throttle, and then start to die while in neutral. When in gear, it gave no indication of having any power. (This is the problem I've seen described elsewhere, but with no answer ever given.)

My brother suggested that the carbs were sucking in too much air, from a possible leak somewhere. I checked all of the vacuum tubes, the intakes, etc, with no luck. Nothing I did would get the carbs to stop sucking in too much air.

Finally, I stumbled across the solution. During all of this testing, I had the air filter assembly off of the bike. Apparently, the air filter housing and assembly restrict a lot of air from the carburetors.

Reinstalling the assembly in full caused my bike to run perfectly.

I don't know if this will work in all cases, and I may be wrong about this being the same problem as some of the others I've read about on line, but thought I'd let others know what worked for me.

If anyone else can explain why it works, or correct me if I'm wrong about what fixed my bike, please chime in. I'd love to understand more about how this bike works.
RemyQL is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 04-02-2014, 07:04 AM
Senior Member
 
Ken448's Avatar
 
Join Date: Mar 2012
Location: South East MI
Posts: 960
not really a solution, its common knowledge that most bikes run WAY lean with the air filter assembly off. Which is why when we install PODS on out 1100's and INCREASE air flow, we also have to INCREASE fuel flow to match. Glad you got your bike running well, and are familiar with the carbs! Sounds like you got a great deal!
Ken448 is offline  
post #3 of 7 (permalink) Old 04-02-2014, 09:16 AM
Senior Member
 
SThomas's Avatar
 
Join Date: Feb 2013
Location: Iowa
Posts: 166
Solution to a Common V-Star Problem?

Never run without an airfilter. That's just asking for issues.


Sent from Motorcycle.com Free App

V-Star 1100 Silverado
429 cams
Chubby pods
Speedster Slashdowns
Dyna 3000
AIS Removed
64lb clutch

Sappers Forward
SThomas is offline  
Sponsored Links
Advertisement
 
post #4 of 7 (permalink) Old 04-02-2014, 11:44 AM
Senior Member
 
Join Date: Oct 2011
Location: Buffalo NY
Posts: 570
It's common for 650 riders to take off their air filter assembly and then wonder why their bike isn't running too good?

Man, what a wacky bunch!

Most carbs are setup for use with an air filter and to apply a certain amount if gas to that amount of air coming through said filter.

By taking off the filter, you're introducing a lot more air but not changing the fuel ratio.

2013 H-D FXS Blackline
2006 V-Star 1100 Classic
1980 XS650 Bob (in progress)
1981 XS650

USMC - 0331 - OEF
BP03 is offline  
post #5 of 7 (permalink) Old 04-02-2014, 11:50 AM
Senior Member
 
Join Date: Apr 2013
Location: Fort Worth, Texas
Posts: 458
Quote:
Originally Posted by SThomas View Post
Never run without an airfilter. That's just asking for issues.


Sent from Motorcycle.com Free App
Agreed.

Seeing how you were half way there you could have re-jetted added pods and picked up some power though...

2007 V star 1100 Classic flat black bagger.

SOLD 1999 Bobber https://www.starbikeforums.com/forums...ad.php?t=39129

2002 Roadstar Midnight.
Currently bone stock going to be a bitchin bagger in progress. Already at the shop gettting a custom 2 into 1 exhaust.
Barman84 is offline  
post #6 of 7 (permalink) Old 04-03-2014, 01:24 AM Thread Starter
Junior Member
 
Join Date: Apr 2014
Posts: 7
Quote:
Originally Posted by SThomas View Post
Never run without an airfilter. That's just asking for issues.


Sent from Motorcycle.com Free App

I wasn't trying to necessarily run it w/o an air filter. I was trying to test it after rebuilding the carbs...lol. You can actually do things like that with a car engine, which I have a lot more experience with. I would never try to actually run any vehicle for long w/o an air filter.

Unfortunately, as obvious as this may seem to people with more experience than some of us, those with less experience seem to have problems with it. I've seen multiple posts of people with the exact same symptoms on their bikes around the internet, but no one thinks to mention the possibility of the air box. Just thought I'd attempt to put the information out there to possibly help someone else.
RemyQL is offline  
post #7 of 7 (permalink) Old 04-03-2014, 06:32 AM
Senior Member
 
Join Date: May 2013
Location: Illinois
Posts: 894
RemQl, car's get leaned out, too, but have much larger intake runners to help develop vacuum making the problem less pronounced. Also, look at a car's choke. Notice it's an actual choke? That choke is developing vacuum to decrease the air/fuel ratio. I believe your motorcycle has an enriching circuit instead, which does nothing to increase vacuum, but needs vacuum just like the rest of the fuel circuits. Vacuum is the energy required to operate a carb. Without it fuel cannot flow (gravity's effect stops at the fuel bowl). Because of these things a motorcycle intake system is more sensitive to changes in any part of the intake system than a car by comparison.

Someone more eloquent can probably explain it better.

2013 V Star 1300 Deluxe
OEM Tall Sissy Bar
Memphis Shades Fork Deflectors
Bridgestone Exedra Max Belted Tires
Baron's RSTD 7308 bar
sparkn is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in













Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome